21375126 has 12 divisors (see below), whose sum is σ = 46312812. Its totient is φ = 7125036.

The previous prime is 21375113. The next prime is 21375127. The reversal of 21375126 is 62157312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21375126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 593736 + ... + 593771.

It is an arithmetic number, because the mean of its divisors is an integer number (3859401).

Almost surely, 2^21375126 is an apocalyptic number.

21375126 is an abundant number, since it is smaller than the sum of its proper divisors (24937686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21375126 is a wasteful number, since it uses less digits than its factorization.

21375126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187515 (or 1187512 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21375126 is about 4623.3241288060. The cubic root of 21375126 is about 277.5255004567.

The spelling of 21375126 in words is "twenty-one million, three hundred seventy-five thousand, one hundred twenty-six".